I am currently facing an issue with my iOS app and its associated Preview extension. I am trying to save a file to a shared container using App Groups, so that my main app can read the file. The code works perfectly on the iOS simulator, but when I run the app on a physical device I encounter a "You don't have permission to save the file" error.
{Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}
Here's the relevant code snippet:
let appGroupIdentifier = "group.com.yourcompany.yourapp"
func saveDataToSharedContainer(fileName: String, data: Data) -> Bool {
guard let containerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroupIdentifier) else {
print("Error: Unable to access the shared container.")
return false
}
let fileURL = containerURL.appendingPathComponent(fileName)
do {
try data.write(to: fileURL, options: .atomic)
print("Data saved to shared container successfully.")
return true
} catch {
print("Error: Unable to save data to shared container. \(error)")
return false
}
}
Called with this:
let fileName = "example.txt"
let dataToSave = "Hello, World!".data(using: .utf8)!
if testSaveDataToSharedContainer(fileName: fileName, data: dataToSave) {
print("Data saved successfully.")
} else {
print("Error saving data.")
}
I have already verified the following:
- App Groups capability is enabled for both the main app target and the extension target.
- The App Group identifier is consistent in both the main app target and the extension target, as well as in the Swift code.
- Provisioning profiles and signing certificates are up-to-date, and the issue persists after cleaning the project and resetting the provisioning profiles.
Despite trying these steps, the issue remains unresolved. This error is reproducible in a new project with a Preview extension.
I would greatly appreciate any insights or suggestions from the community to help me resolve this issue.
Thank you in advance!
